Securities (Narrative) (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) security $ / shares shares	Dec. 31, 2021 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Private mortgage-backed security fair value	$ 900,000	$ 900,000
Number of securities held in an unrealized loss position | security	600	371
Investment securities, pledged as collateral for public deposits	$ 852,800,000	$ 951,400,000
FHLB stock and FRB stock, cost	32,200,000	22,300,000
FHLB, cost	5,300,000	4,600,000
FRB stock	$ 26,800,000	$ 17,800,000
Visa, Inc | Common Class B
Debt and Equity Securities, FV-NI [Line Items]
Stock owned (in shares) | shares	12,356
Carrying value of shares	$ 0
Visa, Inc | Common Class A
Debt and Equity Securities, FV-NI [Line Items]
Conversion price (in dollars per share) | $ / shares	$ 1.62
Conversion of stock (in shares) | shares	19,993